Increase maximum database size for mailbox store

[This topic is intended to address a specific issue called out by the Exchange Server Analyzer Tool. You should apply it only to systems that have had the Exchange Server Analyzer Tool run against them and are experiencing that specific issue.
The Exchange Server Analyzer Tool, available as a free download, remotely collects configuration data from each server in the topology and automatically analyzes the data. The resulting report details important configuration issues, potential problems, and nondefault product settings. By following these recommendations, you can achieve better performance, scalability, reliability, and uptime.
For more information about the tool or to download the latest versions, see "Microsoft Exchange Analyzers" at http://go.microsoft.com/fwlink/?linkid=34707.]

The Exchange Server Best Practices Analyzer displays an error if the following conditions are true:

The server is running Exchange Server 2003.

The service has Service Pack 2 for Exchange Server 2003 installed.

The Exchange Server database size is larger than 16 gigabytes (GB).

The Database Size in Gb registry value has not been set.

This error indicates that the identified Exchange database is close to its size limit. Service Pack 2 for Exchange Server 2003 raises the database storage limits from 16 GB to 75 GB. However, to use the new limits you must manually add the Database Size in Gb registry value on the Exchange Server.

Important:

This article contains information about editing the registry. Before you edit the registry, make sure you understand how to restore the registry if a problem occurs. For information about how to restore the registry, view the "Restore the Registry" Help topic in Regedit.exe or Regedt32.exe.

To correct this error by adding the Database Size in Gb registry value

On the computer that is running Exchange Server, open a registry editor such as Regedit.exe or RegEdt32.exe.

Right-click MailboxStoreGUID, point to New, and then click DWORD Value.

For the new value name, type Database Size Buffer in Percentage.

Double-click Database Size Buffer in Percentage. In Value data, type a value between 1 and 100 to specify when you want events to be logged to warn you that you are nearing the maximum size for a database. Click OK.

Note:

The default value of 10 will cause warning events to be logged when you have 10 percent capacity left before you reach the maximum size for that database.

Right-click MailboxStoreGUID, point to New, and then click DWORD Value.

For the new name, type Database Size Check Start Time in Hours From Midnight.

Double-click Database Size Check Start Time in Hours From Midnight. In Value data, type a value between 0 and 23 to specify when you want Exchange to look at the database size. Click OK.

Note:

The default value of 5 causes Exchange Server to look at the database size at 5 hours after midnight (05:00).